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Both sides on Question One, which deals with legalizing same-sex marriage, worked their respective get-out-the-vote campaigns on Monday in hopes of winning over voters.

Supporters of the Yes on One campaign, which seeks to legalize same-sex marriage in Maine, had hundreds of volunteers working the phones and canvassing areas.

In Portland, more than 100 Yes on One volunteers are working around the clock to get out their last-minute message.

"They are making phone calls, knocking on doors, going around just talking to all the pockets of voters," said Yes on One campaign manager Matt McTighe.

The No on One supporters, which is against the same-sex marriage initiative in Maine, gathered people for an afternoon rally in Lewiston and spent their lunch hour holding up signs to passersby in Auburn.

"I think this is going to be so close that turnout is going to be crucial, and I think those on this side, we're more motivated. A lot are Republicans, and so this is a presidential election, so I think we have the numbers to win this," said No on One supporter Kevin Quinn.

Quinn said he knows they are probably not changing anyone's mind, but instead they were looking to encourage people who may be still undecided about voting in the first place.

"To get them to come out to vote, to let them know there are more people out there than they think, and I feel very confident we are going to win this tomorrow," he said.

Same-sex marriage supporters have not forgotten what happened in 2009, when they lost. That year, there was a 58 percent voter turnout.

The Yes on One side is hoping to take advantage of a higher voter turnout expected with the presidential election.

"If there is anybody that they know who even, if there is just a little shred of doubt that they are not 100 percent sure they are going to vote tomorrow, we talk to them about why this vote is so important to so many families already living here in Maine," McTighe said.

According to the Maine Commission on Governmental Ethics and Election Practices, 25 different organizers registered with the state to spend money for an against-the-issue event.